IsCallBack,Iscrosspagepostback,Form posting

Jul 1 2010 10:42 PM
Hi all,
Please help me ...
 What is the exact difference between Iscallback and Is Crosspage Postback.
  What is the purpose of this property. What does it checks.  I came to know something  like iscallback is the result result of browser...

What is form posting in asp.net . How it differs from other state management techniques